RegEx not matching node.js output

[espruino-discuss3]

Posted at 2019-01-20 by barbiani

Hello everybody,

I am trying to match the second string between quotes and while it works fine on node.js it fails on espruino v1.99.

With the resources available on espruino, how else would you do it?

espruino 1.99:
>/\w+\.\w+/g.exec("form-data; name=\"file\"; filename=\"file.txt\"")[0]
="me=\"file.txt"

node.js:
/\w+\.\w+/g.exec("form-data; name=\"file\"; filename=\"file.txt\"")[0]
=> 'file.txt'

v2.01 is broken too.

Thank you.

[espruino-discuss3]

Posted at 2019-01-21 by @gfwilliams

Looks like there's a bug in how the index of the match is calculated - however if you make it a group then you can extract that group and you're sorted.

/(\w+\.\w+)/g.exec("form-data; name=\"file\"; filename=\"file.txt\"")[1]

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Posted at 2019-01-21 by @gfwilliams

It's now fixed, so the latest builds will work better

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Posted at 2019-01-21 by barbiani

Thank you.

I am not good at regular expressions. A better solution would be to look for the content between quotes after 'filename=' (to also get filenames without extension), but at least we spotted a small bug.

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Posted at 2019-01-22 by @gfwilliams

Ok, in that case I'd suggest:

/filename="([^"]+)"/g.exec("form-data; name=\"file\"; filename=\"file.txt\"")[1]

Which matches filename="..." and returns what's inside the quotes

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Posted at 2019-12-14 by Ptitonio

Hello everyone,
It seems that the quantifiers '?' and '{}' don't work'

/2?\d/.exec("24") // return null rather than 24

Are they implemented ?

Thank you.